Here is some interesting info from the ITD website.
Since the politics of Korea resulted in such a great loss of potential instructors, as well as the home base in Seoul, alternative means to certify instructors needed to be established. The ITF for a time being operated out of the successful school network that Grandmaster Park Jong-Soo set up in Canada. He also was the Secretary General of the ITF. When the ITF held their first World Championship in Montréal Canada back in 1974, they also hosted a course for local and foreign instructors to prepare for that major event. The course may have actually been called an Umpire Course as it went over the competition rules, regulations and scoring system. However they also taught both fundamental movements as well as the 24 Patterns in place at the time. The extensive training took place over a 6-day period. That course was taught by General Choi and Grandmaster J.C. Kim (Jong-Chan), who also was the Chief Instructor for the first ones back in Seoul Korea. They were assisted by VI Dan (6th Degree) Instructors Park Jong-Soo, Rhee Ki-Ha and Kong Yong-Il
The 29 senior Instructors and black belts from around the world General Choi was able to assemble and have attend this first ever type of seminar were:
VIII Dan:
NAM Tae-Hi (1 of the 1st 3 Original Masters of TKD, Pioneer of TKD in Vietnam)
VII Dan:
KIM In-Mook (Graduated 1967 ITF Course, Pioneer of TKD in Mid-West America 60s)
LEE Haeng-Ung (ATA Founder)
VI Dan:
LEE Suk-Hi (A Pioneer of TKD in Europe & Canada)
KIM Jong-Chan (1st ITF Chief Instructor & a Pioneer of TKD in Malaysia & Canada)
CHOI Chang-Keun (1st Person to leave Korea as an official TKD Instructor)
PARK Jong-Soo (Pioneer of TKD in Europe & Canada)
RHEE Ki-Ha (A Pioneer of TKD in Singapore & the Pioneer in the U.K.)
KONG Yong-Il (Toured around the world performing with Gen. Choi)
HWANG Kwang-Joo (USA)
CHUNG Kee-Tae (Canada)
KANG Dong-Won (Founder of Traditional TaeKwon-Do Magazine)
EUN Sank-Ki (Canada)
PARK Jung-Tae (Pioneer of TKD in north Korea, a Pioneer to Japan & China)
CHUN Duk-Ki (Canada)
LIM Chang-Soo (USA)
KIM Nam-Kyun (America)
HWANG Kwang-Sung (Former Special Assistant to Gen. Choi, founder of UITF)
V Dan:
YANG Dong-Ja (Former President PanAm TKD Union & TKD Reform Leader)
YU James B.C. (USA)
YU Byung-Chool (USA)
WALSON, Robert (Referred to by Gen. Choi as the leading American authority on TKD)
SEREFF, Charles E. (President of the USTF)
CHOI Ik-Sun (Canada)
IV Dan:
LOW Koon Lin (1st student of TKD in Malaysia, the 2nd Home of TKD)
YUN Ju-Ahn (USA)
POND, Daniel (Germany)
III Dan:
CHAANINE, David (1st Black Belt in Lebanon)
OH Chung-Won (Canada)